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EP0944440B1 - Device for dispensing an extrusible substance such as a paste for dental use - Google Patents

Device for dispensing an extrusible substance such as a paste for dental use Download PDF

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Publication number
EP0944440B1
EP0944440B1 EP97952984A EP97952984A EP0944440B1 EP 0944440 B1 EP0944440 B1 EP 0944440B1 EP 97952984 A EP97952984 A EP 97952984A EP 97952984 A EP97952984 A EP 97952984A EP 0944440 B1 EP0944440 B1 EP 0944440B1
Authority
EP
European Patent Office
Prior art keywords
reservoir
plate
orifice
piston
sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97952984A
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German (de)
French (fr)
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EP0944440A1 (en
Inventor
Patrick Lesage
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Individual
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Individual
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Publication of EP0944440A1 publication Critical patent/EP0944440A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/01Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like
    • B05C17/0116Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like characterised by the piston driving means
    • B05C17/012Stepwise advancing mechanism, e.g. pawl and ratchets
    • B05C17/0123Lever actuated
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00Impression cups, i.e. impression trays; Impression methods
    • A61C9/0026Syringes or guns for injecting impression material; Mixing impression material for immediate use
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00503Details of the outlet element
    • B05C17/00516Shape or geometry of the outlet orifice or the outlet element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00593Hand tools of the syringe type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00596The liquid or other fluent material being supplied from a rigid removable cartridge having no active dispensing means, i.e. the cartridge requiring cooperation with means of the handtool to expel the material
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/24Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic

Definitions

  • the present invention relates to a device for dispensing a extrudable material.
  • the invention finds particular application in the dental field, for the distribution of pasty products such as for example materials for the impression taking, waxes for filling the canal, composite resins or cements for teeth restoration treatments or materials such as that described in document WO-A-90/15587, used for widen the gum line.
  • pasty products such as for example materials for the impression taking, waxes for filling the canal, composite resins or cements for teeth restoration treatments or materials such as that described in document WO-A-90/15587, used for widen the gum line.
  • the present invention can be used in other areas for the extrusion of various materials such as adhesives, cements, waxes or elastomers.
  • exrudable material is meant here any material which, at the Unlike liquid materials, it does not flow under the simple effect of gravity. Such materials can have various viscosities.
  • the viscosity of the insertion material described in French patent N ° 8907812 to which the invention applies more particularly is between approximately 13,000 and about 30,000 Pa.s.
  • Such devices generally include a reservoir intended for contain said material to be extruded and to cooperate with means forming a piston sliding in said tank and able to allow the transfer of said material in a nozzle extending said reservoir.
  • the present invention relates more particularly to a device belonging to this second category.
  • the main problem to solve, for the design of a device belonging to this second category is of course that of the seal between the nozzle and the reservoir, in particular during the delivery phase of the material.
  • the devices known until now day use more or less elaborate mechanical fixings between the nozzle and the tank, such as for example a screw fixing or a fixing of the bayonet type.
  • the reservoir containing the liquid to be injected usually consists of a glass bulb, and has a closed orifice by a plug, possibly perforable, made of an elastomeric material.
  • the plug has a central orifice in which said tip can be force-fitted with friction.
  • the seal between the nozzle and the reservoir containing the liquid to injecting is therefore ensured by the cooperation of two surfaces cylindrical firmly linked together by radial clamping, one of the surfaces being further elastically deformable.
  • the tank being made of glass, it is particularly fragile and could in no case be suitable for the distribution of a material extrudable.
  • the ampoule containing the drug to be injected has a conical end provided with an elastic collar 24.
  • a needle hypodermic 42 comprising a body 43 provided with a cavity 47 is mounted on the syringe 10.
  • the elastic collar 24 is supported in the conical cavity 47 of the body 43 of the hypodermic needle as shown in Figure 4.
  • This device therefore has substantially the same drawbacks than previously stated.
  • the object of the present invention is to resolve the technical problem consisting in the supply of a device for the distribution of a extrudable material of a new design, guaranteeing a perfect seal between the tank and the nozzle during the material delivery phase, without use mechanical fastening means, while allowing separation very easy from the reservoir and the nozzle, after said delivery phase.
  • the present invention also aims to solve this problem technique by providing a device that is easy to implement and a relatively moderate cost.
  • the originality of the device according to the present invention lies in the fact that this is the force developed by the piston for the extrusion of the material which ensures the contact and the maintenance in tight contact between the separable nozzle and the tank.
  • This force the more tightness is strong.
  • the nozzle and said reservoir are automatically separated when these faces are not kept in contact of support one against the other.
  • the nozzle being separable from the tank, its change is therefore extremely easy, since there is no mechanical fixing and therefore no unlocking operation prior to disassembly of the nozzle.
  • the contact support between the sealing face and the wall of the reservoir orifice having a component axial and not an essentially radial component.
  • the device is sealed according to the invention essentially along a line and not by cooperation of two surfaces between them.
  • said sealing part is worn peripherally and coaxially by said tip.
  • the said sealing part has a first substantially frustoconical face forming said sealing face and a second substantially planar face capable of bear against said plate thus forming the aforementioned means for immobilizing said sealing part with respect to said plate.
  • FIG. 1 therefore shows a device for distributing a extrudable material according to the present invention.
  • This device comprises a base generally represented by the reference number 1 carrying means for controlling the movement of a piston 2, the rod of which is carried by said base.
  • piston displacement control means can be of various conformations and include in the example shown an element forming a plate 3 capable of being actuated by a handle 4 shaped to transmit, by multiplying it by leverage, the force developed by the user between the fingers and the palm of the hand.
  • the base 1 is intended to accommodate, as will be explained below, a tank 6 intended to contain the material to be extruded and a separable tip 7, generally tubular shape, arranged in the extension of the latter.
  • the reservoir 6 has in its front part (or mesial part) a face comprising an orifice 8 defined by a substantially cylindrical wall and opening into a chamber 9 of substantially cylindrical shape containing the material to be extruded, open on its face opposite to that comprising the orifice 8.
  • the piston 2 is adapted to slide in the chamber 9 of the tank 6 so as to exert sufficient force on the material to force it back outside through hole 8.
  • the base 1 is secured to a plate element 11 arranged in a plane substantially orthogonal to the direction of movement of the piston 2, said plate having a passage 12 adapted to receive the end piece 7 and arranged opposite the tank port 8.
  • the plate element 11 is part integral with the base 1 and constitutes the front end thereof.
  • a distribution device conforming to the present invention further comprises a sealing part specifically shaped to connect the nozzle 7 to the tank 6 without fixing and so waterproof during the delivery phase of said material.
  • the sealing part generally has on the one hand a orifice extending the passage 12 of the plate 11, and on the other hand a face seal facing the tank 6 and able to cooperate, in particular by a contact contact substantially without friction, and without radial tightening, with the orifice 8 by providing a seal between itself and the wall of said orifice under the effect displacement of the reservoir 6 towards the plate 11 in response to the displacement of the piston 2 in tank 6.
  • this sealing face is also shaped to automatically separate from the wall of the orifice 8 when it is no longer kept in contact with the latter, i.e. under the effect of displacement of the reservoir in the direction opposite to the plate 11 in response to the withdrawal of said piston.
  • the dispensing device comprises generally means for making a sealed connection between the end piece 7 and the sealing part as well as means for immobilizing said sealing part with respect to the plate 11, which will be described in more detail below.
  • the sealing part generally represented by the reference numeral 13 is carried peripherally and coaxially by the end piece 7.
  • the sealing part 13 will generally be fixed irreversibly at the end piece 7, for example by welding or gluing, or even these two elements can form a single piece as in the example shown.
  • sealing part 13 can also be fixed by reversibly at the end piece 7, for example by screwing or by friction adjustment hard.
  • the part said sealing is an integral part of the plate 11 and protrudes out of it.
  • the sealing part 13 can be arranged so that the proximal end 16 of the endpiece opens into the chamber 9 of the tank 6 as in the example shown.
  • the sealing part 13 will be disposed at the end of the nozzle 7, as shown in FIG. 5.
  • the part seal 13 has a first face 14 of substantially frustoconical shape forming the aforementioned sealing face and a second substantially planar face 15, opposite to said first face and intended to come into abutment against the plate 11 and to immobilize the sealing part 13 relative to the plate 11, at least under the effect of moving tank 6 to plate 11 in response to moving piston 2 in tank 6.
  • the first face 14 can also have a shape that is substantially hemispherical.
  • the wall defining the orifice 8 is substantially cylindrical.
  • sealing face 14 and the wall defining the orifice 8 come into contact with each other under the effect of displacement of the reservoir 6 towards the plate 11 along a line (intersection of a frustoconical or hemispherical surface and a cylindrical surface).
  • the face of the sealing part and the wall defining the orifice 8 of the reservoir 6 are made of materials capable of allowing relative deformation of parts in contact, at least under the effect of the displacement of the reservoir 6 towards the plate 11 in response to the displacement of the piston 2 in the tank 6, in thus guaranteeing a perfect seal.
  • the sealing face of the sealing piece can be made of a plastic material such as for example polypropylene, while that the wall of the orifice 8 of the reservoir 6 can be made of metal.
  • the sealing face 14 and the wall of the orifice 8 can also both be made of a plastic material such as for example polypropylene.
  • the angle ⁇ defining the frustoconical surface of the sealing face 14 can vary within wide limits and depends, as we understand, on the viscosity of the product to be extruded.
  • This angle will generally be between 5 and 85 ° and will be preferably around 20 ° for a product with a viscosity of between 13,000 and 30,000 Pa.s at 20 ° C.
  • the wall defining the orifice 8 of the reservoir 6 can be cylindrical, as previously indicated, or may also form a chamfered edge.
  • the angle forming the chamfered edge will be advantageously different from the angle ⁇ defining the frustoconical surface of the sealing face 14, so that the contact between the sealing face 14 and the wall of the orifice 8 is established, as mentioned previously, substantially along a line.
  • the diameters D1 of the chamber 9 of the reservoir 6, D2 of the orifice 8 of the reservoir 6 and D3 of the nozzle 7 will advantageously be chosen to ensure good distribution of the material to be extruded without affecting the seal. These diameters can easily be determined by a person skilled in the art.
  • a first phase illustrated by FIG. 2, the end piece 7 and the tank 6 are positioned on the base 1.
  • the end piece 7 is housed in the passage 12 of the plate 11 then the reservoir 6 is arranged so that the piston 2 enters the chamber 9 and come into contact with matter.
  • piston 2 serves as a means of supporting the reservoir 6.
  • the piston 2 is controlled in movement towards the plate 11 by means of the handle 4 which causes, as we understand, the relative approximation and then the setting contact of the nozzle 7 and of the reservoir 6.
  • the force exerted by the piston 2 on the material to be extruded guarantees the seal between the surface 14 of the part 13 and the orifice 8.
  • the plate 11 exerts the reaction to the force of the piston thus allowing the connection of the nozzle 7 to the tank 6 without fixing and in a leaktight manner at least during the phase of repression of matter.
  • the base 1 is preferably provided with a non-return means as by example a plate 17 inclined in the use position cooperating with a spring and having an orifice allowing the free movement of the piston rod when the plate is brought into an upright position (i.e. when said plate is substantially orthogonal to the piston rod) and preventing the piston 2 from move in the opposite direction to that of the movement towards the plate 11 when the plate 17 is in its inclined position shown in FIG. 1.
  • a non-return means as by example a plate 17 inclined in the use position cooperating with a spring and having an orifice allowing the free movement of the piston rod when the plate is brought into an upright position (i.e. when said plate is substantially orthogonal to the piston rod) and preventing the piston 2 from move in the opposite direction to that of the movement towards the plate 11 when the plate 17 is in its inclined position shown in FIG. 1.
  • the withdrawal of the end piece 7 can be carried out relatively easily.
  • the inclined plate 17 is straightened to allow the displacement of the piston towards the proximal part of the base.
  • the nozzle 7 can be easily separated from the reservoir 6, (as soon as no force keeps the sealing face 14 in contact with the wall of the orifice 8 of the tank 6) and removed from passage 12 of plate 11.
  • the device for distributing an extrudable material which has just been described has many advantages.
  • the base can be easily cleaned and sterilized before treatment.
  • the end piece and the sealing piece can advantageously be for single use.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Coating Apparatus (AREA)

Description

La présente invention a pour objet un dispositif de distribution d'une matière extrudable.The present invention relates to a device for dispensing a extrudable material.

L'invention trouve notamment application dans le domaine dentaire, pour la distribution de produits pâteux tels que par exemple des matériaux pour la prise d'empreintes, des cires pour l'obturation canalaire, des résines composites ou des ciments pour les traitements de restauration des dents ou encore des matériaux d'insertion tels que celui décrit dans le document WO-A-90/15587, utilisé pour élargir le sillon gingival.The invention finds particular application in the dental field, for the distribution of pasty products such as for example materials for the impression taking, waxes for filling the canal, composite resins or cements for teeth restoration treatments or materials such as that described in document WO-A-90/15587, used for widen the gum line.

D'une façon plus générale, la présente invention peut être utilisée dans d'autres domaines pour l'extrusion de matières variées telles que des colles, des ciments, des cires ou des élastomères.More generally, the present invention can be used in other areas for the extrusion of various materials such as adhesives, cements, waxes or elastomers.

Par "matière extrudable" on entend désigner ici toute matière qui, à la différence des matières liquides, ne s'écoule pas sous le simple effet de la gravité. De telles matières peuvent présenter des viscosités variées. A titre d'exemple, la viscosité du matériau d'insertion décrit dans le brevet français N°8907812 auquel l'invention s'applique plus particulièrement, est comprise entre environ 13.000 et environ 30.000 Pa.s.By "extrudable material" is meant here any material which, at the Unlike liquid materials, it does not flow under the simple effect of gravity. Such materials can have various viscosities. For example, the viscosity of the insertion material described in French patent N ° 8907812 to which the invention applies more particularly, is between approximately 13,000 and about 30,000 Pa.s.

De nombreux dispositifs de distribution d'une matière extrudable ont été proposés dans l'état de la technique et notamment dans le domaine dentaire.Many devices for distributing an extrudable material have have been proposed in the state of the art and in particular in the dental field.

De tels dispositifs comprennent généralement un réservoir destiné à contenir ladite matière à extruder et à coopérer avec des moyens formant piston coulissant dans ledit réservoir et aptes à permettre le transfert de ladite matière dans un embout prolongeant ledit réservoir.Such devices generally include a reservoir intended for contain said material to be extruded and to cooperate with means forming a piston sliding in said tank and able to allow the transfer of said material in a nozzle extending said reservoir.

On distingue dans l'état de la technique deux grandes catégories de dispositifs de distribution du type précité :

  • ceux dans lesquels le réservoir et l'embout sont constitués d'une pièce unique ;
  • ceux dans lesquels le réservoir et l'embout sont constitués de deux éléments distincts.
There are two main categories of distribution devices of the aforementioned type in the prior art:
  • those in which the reservoir and the nozzle consist of a single piece;
  • those in which the reservoir and the nozzle consist of two separate elements.

La présente invention concerne plus particulièrement un dispositif appartenant à cette deuxième catégorie.The present invention relates more particularly to a device belonging to this second category.

Le principal problème à résoudre, pour la conception d'un dispositif appartenant à cette deuxième catégorie est bien entendu celui de l'étanchéité entre l'embout et le réservoir, en particulier au cours de la phase de refoulement de la matière.The main problem to solve, for the design of a device belonging to this second category is of course that of the seal between the nozzle and the reservoir, in particular during the delivery phase of the material.

Pour résoudre ce problème technique, les dispositifs connus jusqu'à ce jour font appel à des fixations mécaniques plus ou moins élaborées entre l'embout et le réservoir, comme par exemple une fixation par vissage ou une fixation du type à baïonnette.To solve this technical problem, the devices known until now day use more or less elaborate mechanical fixings between the nozzle and the tank, such as for example a screw fixing or a fixing of the bayonet type.

De tels dispositifs ont notamment été décrits dans les brevets US 3.121.516 et US 3.767.085.Such devices have in particular been described in the US patents 3,121,516 and US 3,767,085.

S'ils apportent une solution satisfaisante au problème de l'étanchéité entre l'embout et le réservoir, ces dispositifs connus sont souvent fragiles, présentent une forme complexe facilement encrassée par le produit extrudé et difficile à nettoyer. Ils sont d'une mise en oeuvre relativement peu aisée lors du changement de l'embout ou du réservoir.If they provide a satisfactory solution to the problem of sealing between the nozzle and the reservoir, these known devices are often fragile, have a complex shape easily fouled by the extruded product and difficult to clean. They are relatively difficult to implement during the changing the nozzle or the reservoir.

On connaít également dans l'état de la technique, et notamment dans le domaine dentaire, des dispositifs destinés à l'injection de liquide, notamment par voie hypodermique, comportant un réservoir et un embout séparable.We also know in the state of the art, and in particular in in the dental field, devices intended for the injection of liquid, in particular hypodermically, comprising a reservoir and a separable tip.

De tels dispositifs ont par exemple été décrits dans les documents BE 515.066, FR 2.245.382, FR 1.320.820, US 1.818.670.Such devices have for example been described in the documents BE 515.066, FR 2.245.382, FR 1.320.820, US 1.818.670.

Dans ces dispositifs connus, le réservoir contenant le liquide à injecter est généralement constitué d'une ampoule de verre, et comporte un orifice obturé par un bouchon, éventuellement perforable, réalisé en une matière élastomérique.In these known devices, the reservoir containing the liquid to be injected usually consists of a glass bulb, and has a closed orifice by a plug, possibly perforable, made of an elastomeric material.

Le bouchon comporte un orifice central dans lequel ledit embout peut être emmanché à force avec frottement.The plug has a central orifice in which said tip can be force-fitted with friction.

L'étanchéité entre l'embout et le réservoir contenant le liquide à injecter est par conséquent assurée par la coopération de deux surfaces cylindriques fermement liées entre elles par un serrage radial, l'une des surfaces étant en outre déformable élastiquement.The seal between the nozzle and the reservoir containing the liquid to injecting is therefore ensured by the cooperation of two surfaces cylindrical firmly linked together by radial clamping, one of the surfaces being further elastically deformable.

Outre, qu'ils ne sont pas destinés à la distribution de matières extrudables, ces dispositifs connus présentent l'inconvénient de conduire à une fixation mécanique de l'embout sur le réservoir, l'embout n'étant séparable dudit réservoir que sous l'effet d'une force extérieure relativement importante.Besides, that they are not intended for the distribution of materials extrudable, these known devices have the disadvantage of leading to a mechanical attachment of the nozzle to the reservoir, the nozzle not being separable from said tank only under the effect of a relatively large external force.

En outre, le réservoir étant constitué de verre, il est particulièrement fragile et ne pourrait en aucun cas convenir pour la distribution d'une matière extrudable.In addition, the tank being made of glass, it is particularly fragile and could in no case be suitable for the distribution of a material extrudable.

Un dispositif d'une conception voisine de celle décrite dans les documents précités est révélé par le document FR 641 819. A device with a design similar to that described in the above documents is revealed by document FR 641 819.

Dans ce dispositif, l'ampoule contenant le médicament à injecter présente une extrémité conique munie d'un collier élastique 24. Une aiguille hypodermique 42 comprenant un corps 43 muni d'une cavité 47 est montée sur la seringue 10.In this device, the ampoule containing the drug to be injected has a conical end provided with an elastic collar 24. A needle hypodermic 42 comprising a body 43 provided with a cavity 47 is mounted on the syringe 10.

Le collier élastique 24 prend appui dans la cavité conique 47 du corps 43 de l'aiguille hypodermique comme le montre la figure 4.The elastic collar 24 is supported in the conical cavity 47 of the body 43 of the hypodermic needle as shown in Figure 4.

Ainsi, l'étanchéité de ce dispositif connu est assurée par la coopération de deux surfaces tronconiques avec interposition d'un joint élastique.Thus, the sealing of this known device is ensured by cooperation of two frustoconical surfaces with the interposition of an elastic joint.

Ce dispositif présente donc sensiblement les mêmes inconvénients qu'énoncés précédemment.This device therefore has substantially the same drawbacks than previously stated.

Dans ces conditions, la présente invention a pour but de résoudre le problème technique consistant en la fourniture d'un dispositif de distribution d'une matière extrudable d'une nouvelle conception, garantissant une parfaite étanchéité entre le réservoir et l'embout pendant la phase de refoulement de la matière, sans faire appel à des moyens de fixation mécanique, tout en permettant une séparation très aisée du réservoir et de l'embout, après ladite phase de refoulement.Under these conditions, the object of the present invention is to resolve the technical problem consisting in the supply of a device for the distribution of a extrudable material of a new design, guaranteeing a perfect seal between the tank and the nozzle during the material delivery phase, without use mechanical fastening means, while allowing separation very easy from the reservoir and the nozzle, after said delivery phase.

La présente invention a encore pour but de résoudre ce problème technique par la fourniture d'un dispositif qui soit facile à mettre en oeuvre et d'un coût relativement modéré.The present invention also aims to solve this problem technique by providing a device that is easy to implement and a relatively moderate cost.

La solution conforme à la présente invention pour résoudre ce problème technique consiste en un dispositif de distribution d'une matière extrudable comprenant :

  • un réservoir destiné à contenir la matière et comportant au moins un orifice ;
  • un embout tubulaire séparable communiquant, en position d'utilisation, avec ledit réservoir par ledit orifice;
  • un piston apte à coulisser, en position d'utilisation, dans ledit réservoir et à exercer sur ladite matière une force suffisante pour la refouler à l'extérieur via l'embout ;
  • une embase portant des moyens de commande en déplacement dudit piston et comportant un élément formant plaque disposé dans un plan sensiblement orthogonal à la direction de déplacement dudit piston, ladite plaque présentant un passage apte à recevoir ledit embout et disposé en regard de l'orifice dudit réservoir;
  • une pièce d'étanchéité disposée entre ledit élément formant plaque 11 et ledit réservoir 6 et présentant un orifice prolongeant le passage de ladite plaque ;
  • des moyens pour réaliser une liaison étanche entre ledit embout et ladite pièce d'étanchéité, au moins sous l'effet du déplacement dudit réservoir vers ladite plaque ; et
  • des moyens pour immobiliser ladite pièce d'étanchéité par rapport à ladite plaque, au moins sous l'effet du déplacement dudit réservoir vers ladite plaque,
caractérisé en ce que ladite pièce d'étanchéité présente une face d'étanchéité tournée vers ledit réservoir; ladite face d'étanchéité et la paroi définissant l'orifice étant conformées pour coopérer par contact d'appui sensiblement selon une ligne en étant ainsi aptes :
  • d'une part, à coopérer, par contact d'appui, sensiblement sans frottement, sous l'effet du déplacement dudit réservoir vers ladite plaque en réponse au déplacement dudit piston dans ledit réservoir, pour réaliser ainsi une liaison étanche ; et
  • d'autre part, à être automatiquement séparées l'une de l'autre sous l'effet du déplacement dudit réservoir en direction opposée à ladite plaque.
The solution according to the present invention for solving this technical problem consists of a device for distributing an extrudable material comprising:
  • a reservoir intended to contain the material and comprising at least one orifice;
  • a separable tubular endpiece communicating, in the use position, with said reservoir through said orifice;
  • a piston able to slide, in the position of use, in said reservoir and to exert on said material a force sufficient to force it outside via the nozzle;
  • a base carrying means for controlling the movement of said piston and comprising a plate element disposed in a plane substantially orthogonal to the direction of movement of said piston, said plate having a passage capable of receiving said end piece and disposed opposite the orifice of said tank;
  • a sealing piece disposed between said plate member 11 and said tank 6 and having an orifice extending the passage of said plate;
  • means for making a sealed connection between said nozzle and said sealing part, at least under the effect of the displacement of said reservoir towards said plate; and
  • means for immobilizing said sealing part with respect to said plate, at least under the effect of the displacement of said reservoir towards said plate,
characterized in that said sealing part has a sealing face facing said reservoir; said sealing face and the wall defining the orifice being shaped to cooperate by bearing contact substantially along a line, thus being able:
  • on the one hand, to cooperate, by bearing contact, substantially without friction, under the effect of the displacement of said reservoir towards said plate in response to the displacement of said piston in said reservoir, to thus produce a sealed connection; and
  • on the other hand, to be automatically separated from each other under the effect of the displacement of said reservoir in the direction opposite to said plate.

Ainsi, l'originalité du dispositif conforme à la présente invention réside dans le fait que c'est la force développée par le piston pour l'extrusion de la matière qui assure la mise en contact et le maintien en contact étanche entre l'embout séparable et le réservoir. Plus cette force est importante et plus l'étanchéité est forte. Il n'y a donc aucune limite quant à la viscosité de la matière à extruder.Thus, the originality of the device according to the present invention lies in the fact that this is the force developed by the piston for the extrusion of the material which ensures the contact and the maintenance in tight contact between the separable nozzle and the tank. The greater this force, the more tightness is strong. There is therefore no limit as to the viscosity of the material to be extruded.

En outre, en raison de la conformation particulière de la face d'étanchéité et de la paroi de l'orifice du réservoir, l'embout et ledit réservoir sont automatiquement séparés dès lors que ces faces ne sont pas maintenues en contact d'appui l'une contre l'autre.In addition, due to the particular conformation of the face seal and the wall of the reservoir orifice, the nozzle and said reservoir are automatically separated when these faces are not kept in contact of support one against the other.

L'embout étant séparable du réservoir, son changement est donc extrêmement aisé, dans la mesure où il n'y a pas de fixation mécanique et donc aucune opération de déverrouillage préalable au démontage de l'embout.The nozzle being separable from the tank, its change is therefore extremely easy, since there is no mechanical fixing and therefore no unlocking operation prior to disassembly of the nozzle.

Contrairement aux dispositifs connus de l'état de la technique, il n'existe pas de serrage radial entre l'embout et le réservoir, le contact d'appui entre la face d'étanchéité et la paroi de l'orifice du réservoir ayant une composante axiale et non pas une composante essentiellement radiale.Unlike the devices known from the state of the art, it there is no radial tightening between the nozzle and the reservoir, the contact support between the sealing face and the wall of the reservoir orifice having a component axial and not an essentially radial component.

En outre, contrairement aux dispositifs connus de l'état de la technique, l'étanchéité du dispositif conforme à l'invention est réalisée essentiellement le long d'une ligne et non pas par coopération de deux surfaces entre elles.In addition, unlike the devices known from the state of the technical, the device is sealed according to the invention essentially along a line and not by cooperation of two surfaces between them.

Selon une caractéristique particulière du dispositif conforme à l'invention, ladite pièce d'étanchéité est portée de façon périphérique et coaxiale par ledit embout.According to a particular characteristic of the device in accordance with the invention, said sealing part is worn peripherally and coaxially by said tip.

Selon un mode de réalisation actuellement préféré de l'invention, la pièce d'étanchéité précitée présente une première face sensiblement tronconique formant ladite face d'étanchéité et une deuxième face sensiblement plane apte à venir en appui contre ladite plaque formant ainsi les moyens précités pour immobiliser ladite pièce d'étanchéité par rapport à ladite plaque.According to a currently preferred embodiment of the invention, the said sealing part has a first substantially frustoconical face forming said sealing face and a second substantially planar face capable of bear against said plate thus forming the aforementioned means for immobilizing said sealing part with respect to said plate.

L'invention sera mieux comprise, et d'autres buts, caractéristiques et avantages de celle-ci apparaítront plus clairement à la lecture de la description explicative qui va suivre faite en référence aux dessins annexés donnés uniquement à titre non limitatif et illustrant un mode de réalisation actuellement préféré de l'invention, et dans lesquels :

  • la figure 1 est une vue en coupe transversale d'un dispositif de distribution d'une matière extrudable conforme à la présente invention montrant l'embout et le réservoir au début de leur phase de positionnement ;
  • la figure 2 est une vue en coupe transversale de la partie avant du dispositif représenté à la figure 1 montrant l'embout et le réservoir à l'issue de leur phase initiale de positionnement ;
  • la figure 3 est une vue semblable à la figure 2 montrant l'embout et le réservoir au cours de leur phase de rapprochement et de mise en contact ;
  • la figure 4 est une vue semblable aux figures 2 et 3 montrant l'embout et le réservoir au cours de la phase de refoulement de la matière ; et
  • la figure 5 est une vue semblable à la figure 2 illustrant le principe sur lequel la présente invention repose.
The invention will be better understood, and other objects, characteristics and advantages thereof will appear more clearly on reading the explanatory description which follows, made with reference to the appended drawings given only without limitation and illustrating a method of currently preferred embodiment of the invention, and in which:
  • Figure 1 is a cross-sectional view of a device for dispensing an extrudable material according to the present invention showing the nozzle and the reservoir at the start of their positioning phase;
  • Figure 2 is a cross-sectional view of the front part of the device shown in Figure 1 showing the nozzle and the reservoir at the end of their initial positioning phase;
  • Figure 3 is a view similar to Figure 2 showing the tip and the tank during their approximation phase and contacting;
  • Figure 4 is a view similar to Figures 2 and 3 showing the tip and the tank during the delivery phase of the material; and
  • Figure 5 is a view similar to Figure 2 illustrating the principle on which the present invention is based.

On a donc représenté à la figure 1 un dispositif de distribution d'une matière extrudable conforme à la présente invention.FIG. 1 therefore shows a device for distributing a extrudable material according to the present invention.

Ce dispositif comporte une embase généralement représentée par le chiffre de référence 1 portant des moyens de commande en déplacement d'un piston 2 dont la tige est portée par ladite embase.This device comprises a base generally represented by the reference number 1 carrying means for controlling the movement of a piston 2, the rod of which is carried by said base.

Ces moyens de commande en déplacement du piston peuvent être de conformations variées et comportent dans l'exemple représenté un élément formant plaque 3 susceptible d'être actionné par une poignée 4 conformée pour transmettre, en la multipliant par effet de levier, la force développée par l'utilisateur entre les doigts et la paume de la main.These piston displacement control means can be of various conformations and include in the example shown an element forming a plate 3 capable of being actuated by a handle 4 shaped to transmit, by multiplying it by leverage, the force developed by the user between the fingers and the palm of the hand.

L'embase 1 est destinée à loger, comme il sera expliqué ci-après, un réservoir 6 destiné à contenir la matière à extruder et un embout séparable 7, de forme généralement tubulaire, disposé dans le prolongement de ce dernier.The base 1 is intended to accommodate, as will be explained below, a tank 6 intended to contain the material to be extruded and a separable tip 7, generally tubular shape, arranged in the extension of the latter.

Le réservoir 6 comporte dans sa partie avant (ou partie mésiale) une face comportant un orifice 8 défini par une paroi sensiblement cylindrique et débouchant dans une chambre 9 de forme sensiblement cylindrique contenant la matière à extruder, ouverte sur sa face opposée à celle comportant l'orifice 8.The reservoir 6 has in its front part (or mesial part) a face comprising an orifice 8 defined by a substantially cylindrical wall and opening into a chamber 9 of substantially cylindrical shape containing the material to be extruded, open on its face opposite to that comprising the orifice 8.

Le piston 2 est adapté pour coulisser dans la chambre 9 du réservoir 6 de façon à exercer sur la matière une force suffisante pour la refouler vers l'extérieur au travers de l'orifice 8.The piston 2 is adapted to slide in the chamber 9 of the tank 6 so as to exert sufficient force on the material to force it back outside through hole 8.

L'embase 1 est solidaire d'un élément formant plaque 11 disposé dans un plan sensiblement orthogonal à la direction de déplacement du piston 2, ladite plaque présentant un passage 12 apte à recevoir l'embout 7 et disposé en regard de l'orifice 8 de réservoir.The base 1 is secured to a plate element 11 arranged in a plane substantially orthogonal to the direction of movement of the piston 2, said plate having a passage 12 adapted to receive the end piece 7 and arranged opposite the tank port 8.

Dans l'exemple représenté, l'élément formant plaque 11 fait partie intégrante de l'embase 1 et en constitue l'extrémité avant.In the example shown, the plate element 11 is part integral with the base 1 and constitutes the front end thereof.

D'une façon générale, un dispositif de distribution conforme à la présente invention comprend en outre une pièce d'étanchéité spécifiquement conformée pour raccorder l'embout 7 au réservoir 6 sans fixation et de manière étanche pendant la phase de refoulement de ladite matière.In general, a distribution device conforming to the the present invention further comprises a sealing part specifically shaped to connect the nozzle 7 to the tank 6 without fixing and so waterproof during the delivery phase of said material.

A cette fin, la pièce d'étanchéité présente généralement d'une part un orifice prolongeant le passage 12 de la plaque 11, et d'autre part une face d'étanchéité tournée vers le réservoir 6 et apte à coopérer, notamment par un contact d'appui sensiblement sans frottement, et sans serrage radial, avec l'orifice 8 en réalisant une étanchéité entre elle-même et la paroi dudit orifice sous l'effet du déplacement du réservoir 6 vers la plaque 11 en réponse au déplacement du piston 2 dans le réservoir 6.To this end, the sealing part generally has on the one hand a orifice extending the passage 12 of the plate 11, and on the other hand a face seal facing the tank 6 and able to cooperate, in particular by a contact contact substantially without friction, and without radial tightening, with the orifice 8 by providing a seal between itself and the wall of said orifice under the effect displacement of the reservoir 6 towards the plate 11 in response to the displacement of the piston 2 in tank 6.

De plus, cette face d'étanchéité est également conformée pour se séparer automatiquement de la paroi de l'orifice 8 dès lors qu'elle n'est plus maintenue en contact avec cette dernière, c'est-à-dire sous l'effet du déplacement du réservoir en direction opposée à la plaque 11 en réponse au retrait dudit piston.In addition, this sealing face is also shaped to automatically separate from the wall of the orifice 8 when it is no longer kept in contact with the latter, i.e. under the effect of displacement of the reservoir in the direction opposite to the plate 11 in response to the withdrawal of said piston.

De plus, le dispositif de distribution conforme à l'invention comporte généralement des moyens pour réaliser une liaison étanche entre l'embout 7 et la pièce d'étanchéité ainsi que des moyens pour immobiliser ladite pièce d'étanchéité par rapport à la plaque 11, qui seront décrits plus en détail par la suite.In addition, the dispensing device according to the invention comprises generally means for making a sealed connection between the end piece 7 and the sealing part as well as means for immobilizing said sealing part with respect to the plate 11, which will be described in more detail below.

Selon un mode de réalisation actuellement préféré de l'invention, la pièce d'étanchéité généralement représentée par le chiffre de référence 13 est portée de façon périphérique et coaxiale par l'embout 7.According to a currently preferred embodiment of the invention, the sealing part generally represented by the reference numeral 13 is carried peripherally and coaxially by the end piece 7.

La pièce d'étanchéité 13 sera généralement fixée de façon irréversible à l'embout 7, par exemple par soudure ou collage, ou bien encore ces deux éléments peuvent former une pièce monobloc comme dans l'exemple représenté.The sealing part 13 will generally be fixed irreversibly at the end piece 7, for example by welding or gluing, or even these two elements can form a single piece as in the example shown.

Bien entendu, la pièce d'étanchéité 13 peut être également fixée de façon réversible à l'embout 7, par exemple par vissage ou par ajustage à frottement dur.Of course, the sealing part 13 can also be fixed by reversibly at the end piece 7, for example by screwing or by friction adjustment hard.

Dans tous les cas, il conviendra de s'assurer de la parfaite étanchéité entre l'embout 7 et la pièce d'étanchéité 13. In all cases, it will be necessary to ensure the perfect seal between the nozzle 7 and the sealing part 13.

Selon un mode de réalisation non représenté de l'invention, la pièce d'étanchéité précitée fait partie intégrante de la plaque 11 et fait saillie hors de celle-ci.According to an embodiment not shown of the invention, the part said sealing is an integral part of the plate 11 and protrudes out of it.

La pièce d'étanchéité 13 peut être disposée, de telle sorte que l'extrémité proximale 16 de l'embout débouche à l'intérieur de la chambre 9 du réservoir 6 comme dans l'exemple représenté.The sealing part 13 can be arranged so that the proximal end 16 of the endpiece opens into the chamber 9 of the tank 6 as in the example shown.

Cependant, le principe général de l'invention (figure 5) garantit une parfaite étanchéité entre la pièce d'étanchéité 13 et l'orifice 8 y compris dans le cas où l'extrémité proximale de l'embout ne débouche pas à l'intérieur de la chambre 9 du réservoir 6.However, the general principle of the invention (Figure 5) guarantees a perfect seal between the sealing part 13 and the orifice 8 including in the case where the proximal end of the tip does not open inside the chamber 9 of tank 6.

Dans ce cas, la pièce d'étanchéité 13 sera disposée à l'extrémité de l'embout 7, comme représenté à la figure 5.In this case, the sealing part 13 will be disposed at the end of the nozzle 7, as shown in FIG. 5.

Selon une caractéristique particulière de l'invention, la pièce d'étanchéité 13 présente une première face 14 de forme sensiblement tronconique formant la face d'étanchéité précitée et une deuxième face sensiblement plane 15, opposée à ladite première face et destinée à venir en appui contre la plaque 11 et à immobiliser la pièce d'étanchéité 13 par rapport à la plaque 11, au moins sous l'effet du déplacement du réservoir 6 vers la plaque 11 en réponse au déplacement du piston 2 dans le réservoir 6.According to a particular characteristic of the invention, the part seal 13 has a first face 14 of substantially frustoconical shape forming the aforementioned sealing face and a second substantially planar face 15, opposite to said first face and intended to come into abutment against the plate 11 and to immobilize the sealing part 13 relative to the plate 11, at least under the effect of moving tank 6 to plate 11 in response to moving piston 2 in tank 6.

La première face 14 peut également être de forme sensiblement hémisphérique.The first face 14 can also have a shape that is substantially hemispherical.

Avantageusement, la paroi définissant l'orifice 8 est sensiblement cylindrique.Advantageously, the wall defining the orifice 8 is substantially cylindrical.

Il est important, selon l'invention, que la face d'étanchéité 14 et la paroi définissant l'orifice 8 viennent en contact l'une avec l'autre sous l'effet du déplacement du réservoir 6 vers la plaque 11 selon une ligne (intersection d'une surface tronconique ou hémisphérique et d'une surface cylindrique).It is important, according to the invention, that the sealing face 14 and the wall defining the orifice 8 come into contact with each other under the effect of displacement of the reservoir 6 towards the plate 11 along a line (intersection of a frustoconical or hemispherical surface and a cylindrical surface).

Un tel contact est réalisé, comme on le comprend, sensiblement sans frottement, et sans serrage radial à la différence des dispositifs connus de l'état de la technique.Such contact is made, as we understand, substantially without friction, and without radial tightening unlike the devices known from the state of the technique.

Selon une autre caractéristique particulière de l'invention, la face d'étanchéité de la pièce d'étanchéité et la paroi définissant l'orifice 8 du réservoir 6 sont réalisées dans des matières aptes à permettre une déformation relative des parties en contact, au moins sous l'effet du déplacement du réservoir 6 vers la plaque 11 en réponse au déplacement du piston 2 dans le réservoir 6, en garantissant ainsi une parfaite étanchéité. According to another particular characteristic of the invention, the face of the sealing part and the wall defining the orifice 8 of the reservoir 6 are made of materials capable of allowing relative deformation of parts in contact, at least under the effect of the displacement of the reservoir 6 towards the plate 11 in response to the displacement of the piston 2 in the tank 6, in thus guaranteeing a perfect seal.

Le choix de ces matières dépend essentiellement des contraintes mécaniques qui dépendent elles-mêmes directement de la viscosité du produit.The choice of these materials depends mainly on the constraints mechanical which themselves depend directly on the viscosity of the product.

A titre d'exemple, la face d'étanchéité de la pièce d'étanchéité peut être réalisée en une matière plastique telle que par exemple du polypropylène, tandis que la paroi de l'orifice 8 du réservoir 6 peut être réalisée en métal.By way of example, the sealing face of the sealing piece can be made of a plastic material such as for example polypropylene, while that the wall of the orifice 8 of the reservoir 6 can be made of metal.

La face d'étanchéité 14 et la paroi de l'orifice 8 peuvent également être réalisées toutes deux en une matière plastique telle que par exemple du polypropylène.The sealing face 14 and the wall of the orifice 8 can also both be made of a plastic material such as for example polypropylene.

L'angle α définissant la surface tronconique de la face d'étanchéité 14 peut varier dans de larges limites et dépend, comme on le comprend, de la viscosité du produit à extruder.The angle α defining the frustoconical surface of the sealing face 14 can vary within wide limits and depends, as we understand, on the viscosity of the product to be extruded.

Cet angle sera généralement compris entre 5 et 85° et sera de préférence voisin de 20° pour un produit de viscosité comprise entre 13 000 et 30 000 Pa.s à 20°C.This angle will generally be between 5 and 85 ° and will be preferably around 20 ° for a product with a viscosity of between 13,000 and 30,000 Pa.s at 20 ° C.

La paroi définissant l'orifice 8 du réservoir 6 peut être cylindrique, comme indiqué précédemment, ou peut encore former un bord chanfreiné.The wall defining the orifice 8 of the reservoir 6 can be cylindrical, as previously indicated, or may also form a chamfered edge.

Dans ce dernier cas, l'angle formant le bord chanfreiné sera avantageusement différent de l'angle α définissant la surface tronconique de la face d'étanchéité 14, de façon à ce que le contact entre la face d'étanchéité 14 et la paroi de l'orifice 8 s'établisse, comme mentionné précédemment, sensiblement selon une ligne.In the latter case, the angle forming the chamfered edge will be advantageously different from the angle α defining the frustoconical surface of the sealing face 14, so that the contact between the sealing face 14 and the wall of the orifice 8 is established, as mentioned previously, substantially along a line.

Les diamètres D1 de la chambre 9 du réservoir 6, D2 de l'orifice 8 du réservoir 6 et D3 de l'embout 7 seront avantageusement choisis pour assurer une bonne distribution de la matière à extruder sans nuire à l'étanchéité. Ces diamètres pourront être facilement déterminés par l'homme de métier.The diameters D1 of the chamber 9 of the reservoir 6, D2 of the orifice 8 of the reservoir 6 and D3 of the nozzle 7 will advantageously be chosen to ensure good distribution of the material to be extruded without affecting the seal. These diameters can easily be determined by a person skilled in the art.

Dans le mode de réalisation actuellement préféré de l'invention, ces diamètres peuvent être choisis dans les rapports suivants : D1 = 2D2 ; 3D3 = 2D2. In the presently preferred embodiment of the invention, these diameters can be chosen in the following ratios: D 1 = 2D 2 ; 3D 3 = 2D 2 .

La mise en oeuvre du dispositif de distribution d'une matière extrudable conforme à l'invention se déduit aisément de la structure de ses moyens constitutifs qui viennent d'être décrits.The implementation of the material distribution device extrudable according to the invention is easily deduced from the structure of its means constitutive which have just been described.

Ce fonctionnement sera maintenant décrit plus en détail en référence aux figures 2 à 4.This operation will now be described in more detail with reference in Figures 2 to 4.

Dans une première phase, illustrée par la figure 2, l'embout 7 et le réservoir 6 sont positionnés sur l'embase 1. In a first phase, illustrated by FIG. 2, the end piece 7 and the tank 6 are positioned on the base 1.

A cet effet, l'embout 7 est logé dans le passage 12 de la plaque 11 puis le réservoir 6 est disposé de telle sorte que le piston 2 pénètre dans la chambre 9 et vienne en contact de la matière.To this end, the end piece 7 is housed in the passage 12 of the plate 11 then the reservoir 6 is arranged so that the piston 2 enters the chamber 9 and come into contact with matter.

Il est à noter que le piston 2 sert de moyen de support du réservoir 6.It should be noted that the piston 2 serves as a means of supporting the reservoir 6.

Dans une deuxième phase illustrée par la figure 3, le piston 2 est commandé en déplacement en direction de la plaque 11 au moyen de la poignée 4 ce qui provoque, comme on le comprend, le rapprochement relatif puis la mise en contact de l'embout 7 et du réservoir 6.In a second phase illustrated in FIG. 3, the piston 2 is controlled in movement towards the plate 11 by means of the handle 4 which causes, as we understand, the relative approximation and then the setting contact of the nozzle 7 and of the reservoir 6.

A l'issue de cette phase, la face d'étanchéité 14 de la pièce 13 vient au contact de la paroi définissant l'orifice 8 du réservoir.At the end of this phase, the sealing face 14 of the part 13 comes to contact of the wall defining the orifice 8 of the reservoir.

Dans une troisième phase illustrée par la figure 4, la matière est refoulée vers l'extérieur via l'embout 7.In a third phase illustrated in Figure 4, the material is pumped out via the nozzle 7.

La force exercée par le piston 2 sur la matière à extruder garantit l'étanchéité entre la surface 14 de la pièce 13 et l'orifice 8.The force exerted by the piston 2 on the material to be extruded guarantees the seal between the surface 14 of the part 13 and the orifice 8.

Comme on le comprend (voir également figure 5), la plaque 11 exerce la réaction à la force du piston en permettant ainsi le raccordement de l'embout 7 au réservoir 6 sans fixation et de manière étanche au moins pendant la phase de refoulement de la matière.As can be understood (see also FIG. 5), the plate 11 exerts the reaction to the force of the piston thus allowing the connection of the nozzle 7 to the tank 6 without fixing and in a leaktight manner at least during the phase of repression of matter.

Quelle que soit la force exercée par le piston sur la matière à extruder l'étanchéité est assurée, cette dernière étant d'autant plus forte que la force exercée par le piston est importante.Whatever the force exerted by the piston on the material to be extruded sealing is ensured, the latter being all the stronger as the force exerted by the piston is important.

Pour éviter le retrait du piston pendant la phase de refoulement de la matière, l'embase 1 est de préférence pourvue d'un moyen anti-retour comme par exemple une plaque 17 inclinée en position d'utilisation coopérant avec un ressort et comportant un orifice permettant le libre déplacement de la tige de piston lorsque la plaque est amenée en position droite (c'est-à-dire lorsque ladite plaque est sensiblement orthogonale à la tige de piston) et empêchant le piston 2 de se déplacer dans la direction opposée à celle du déplacement vers la plaque 11 lorsque la plaque 17 est dans sa position inclinée représentée à la figure 1.To avoid withdrawal of the piston during the delivery phase of the material, the base 1 is preferably provided with a non-return means as by example a plate 17 inclined in the use position cooperating with a spring and having an orifice allowing the free movement of the piston rod when the plate is brought into an upright position (i.e. when said plate is substantially orthogonal to the piston rod) and preventing the piston 2 from move in the opposite direction to that of the movement towards the plate 11 when the plate 17 is in its inclined position shown in FIG. 1.

Le retrait de l'embout 7 peut être réalisé de façon relativement aisée.The withdrawal of the end piece 7 can be carried out relatively easily.

A cet effet, la plaque inclinée 17 est redressée pour permettre le déplacement du piston vers la partie proximale de l'embase. Au cours de cette phase, l'embout 7 peut être facilement séparé du réservoir 6, (dès lors qu'aucune force ne maintient la face d'étanchéité 14 en contact avec la paroi de l'orifice 8 du réservoir 6) et retiré du passage 12 de la plaque 11. To this end, the inclined plate 17 is straightened to allow the displacement of the piston towards the proximal part of the base. During this phase, the nozzle 7 can be easily separated from the reservoir 6, (as soon as no force keeps the sealing face 14 in contact with the wall of the orifice 8 of the tank 6) and removed from passage 12 of plate 11.

Le dispositif de distribution d'une matière extrudable qui vient d'être décrit présente de très nombreux avantages.The device for distributing an extrudable material which has just been described has many advantages.

Tout d'abord, il permet une mise en place et un changement aisé de l'embout et/ou du réservoir tout en garantissant une parfaite étanchéité.First of all, it allows easy installation and change of the nozzle and / or the tank while guaranteeing a perfect seal.

Dans le domaine dentaire, il est ainsi possible d'utiliser plusieurs embouts de diamètres différents avec le même réservoir pour des indications différentes, ce qui est impossible avec les dispositifs connus de l'état de la technique qui nécessitent un emmanchement à force de l'embout dans un bouchon, et donc une dimension prédéterminée dudit embout.In the dental field, it is thus possible to use several tips of different diameters with the same tank for indications different, which is impossible with the devices known from the state of the techniques which require a force fitting of the end piece in a plug, and therefore a predetermined dimension of said tip.

Du fait de l'absence de fixation mécanique l'embout et le réservoir peuvent être fabriqués sans problème de tolérance.Due to the lack of mechanical attachment the nozzle and the reservoir can be produced without tolerance issues.

L'embase peut être facilement nettoyée et stérilisée avant traitement. L'embout et la pièce d'étanchéité peuvent être avantageusement à usage unique.The base can be easily cleaned and sterilized before treatment. The end piece and the sealing piece can advantageously be for single use.

Enfin, ce dispositif est d'un coût relativement modéré.Finally, this device is of relatively moderate cost.

Claims (9)

  1. A device for dispensing an extrudable material, the device comprising:
    · a reservoir (6) designed to contain the material and having at least one orifice (8);
    a separable tubular endpiece (7) communicating, in its in-use position, with said reservoir (6) via said orifice (8);
    · a piston (2) suitable for sliding, in use, inside said reservoir and for exerting sufficient force on said material to cause it to be delivered to the outside via the endpiece;
    · a base (1) carrying means for controlling the displacement of said piston and including a plate-forming element (11) disposed in a plane that is substantially orthogonal to the displacement direction of said piston (2), said plate (11) having a passage (12) suitable for receiving said endpiece (7) and being disposed facing the orifice (8) of said reservoir (6);
    · a sealing piece (13) disposed between said plate-forming element (11) and said reservoir and having an orifice extending the passage through said plate (11);
    · means for making a sealed connection between said endpiece (7) and said sealing piece (13), at least under the effect of said reservoir (6) being displaced towards said plate (11); and
    · means for preventing said sealing piece (13) from moving relative to said plate (11), at least under the effect of the displacement of said reservoir (6) towards said plate (11);
    the device being characterized in that said sealing piece (13) has a sealing face (14) facing towards said reservoir (6); said sealing face (14) and the wall defining the orifice (8) being shaped to co-operate by thrust contact substantially along a line thus being suitable:
    · firstly for co-operating by substantially friction-free thrust contact, under the effect of said reservoir (6) being displaced towards said plate (11) in response to the displacement of said piston (2) in said reservoir (6) to establish a sealed connection; and
    · secondly to be automatically separated from each other under the effect of said reservoir being displaced away from said plate.
  2. A device according to claim 1, characterized in that said sealing piece (13) is carried in peripheral and coaxial manner by said endpiece (7).
  3. A device according to claim 1 or 2, characterized in that the above-mentioned sealing piece (13) has a substantially frustoconical first face (14) forming said sealing face and a substantially plane second face (14) suitable for being thrust against said plate (11), thus forming the above-mentioned means for preventing said sealing piece from moving relative to said plate.
  4. A device according to any one of claims 1 to 3, characterized in that the sealing face (14) of the sealing piece (13) and the wall defining the orifice (8) of the reservoir (6) are made of material suitable for enabling relative deformation of the surface that come into contact, at least under the effect of the reservoir (6) being displaced towards the plate (11) in response to the displacement of the piston (2) in the reservoir (6).
  5. A device according to claim 4, characterized in that the above-mentioned sealing face (14) is made of a plastics material, such as polypropylene, for example.
  6. A device according to claim 5, characterized in that the wall of the orifice (8) of the reservoir (6) is made of metal, or of a plastics material.
  7. A device according to any one of claims 1 to 6, characterized in that the wall defining the orifice (8) of the reservoir (6) forms a chamfered edge.
  8. A device according to any one of claims 1 to 7, characterized in that the base (1) includes "non-return" means designed to prevent the piston (2) being displaced in a direction opposite to its displacement direction towards the plate (11).
  9. A device according to any one of claims 1 to 8, characterized in that the above-mentioned sealing piece (13) is disposed in such a manner that the proximal end of the endpiece (7) opens up to the inside of the chamber (9) of the reservoir (6) in the in-use position.
EP97952984A 1996-12-23 1997-12-23 Device for dispensing an extrusible substance such as a paste for dental use Expired - Lifetime EP0944440B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9615847A FR2757429B1 (en) 1996-12-23 1996-12-23 DEVICE FOR DISPENSING EXTRUDABLE MATERIAL SUCH AS A DENT FOR DENTAL USE
FR9615847 1996-12-23
PCT/FR1997/002391 WO1998028090A1 (en) 1996-12-23 1997-12-23 Device for dispensing an extrusible substance such as a paste for dental use

Publications (2)

Publication Number Publication Date
EP0944440A1 EP0944440A1 (en) 1999-09-29
EP0944440B1 true EP0944440B1 (en) 2004-06-23

Family

ID=9498996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97952984A Expired - Lifetime EP0944440B1 (en) 1996-12-23 1997-12-23 Device for dispensing an extrusible substance such as a paste for dental use

Country Status (8)

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US (1) US6170714B1 (en)
EP (1) EP0944440B1 (en)
JP (1) JP4059526B2 (en)
DE (1) DE69729651T2 (en)
ES (1) ES2224291T3 (en)
FR (1) FR2757429B1 (en)
HK (1) HK1022862A1 (en)
WO (1) WO1998028090A1 (en)

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US7033173B2 (en) * 2001-06-15 2006-04-25 Allan Coopersmith Gingival retraction device and method
US7153134B2 (en) 2001-06-15 2006-12-26 Allan Coopersmith Gingival retraction device and method
EP1507572B1 (en) * 2002-05-17 2007-01-10 Tyco Healthcare Group Lp Wound closure material applicator
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EP1886659A1 (en) * 2006-08-08 2008-02-13 3M Innovative Properties Company Curable dental retraction composition, method of production and use thereof
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Also Published As

Publication number Publication date
JP2001506919A (en) 2001-05-29
FR2757429B1 (en) 1999-03-12
US6170714B1 (en) 2001-01-09
DE69729651D1 (en) 2004-07-29
FR2757429A1 (en) 1998-06-26
DE69729651T2 (en) 2005-03-17
HK1022862A1 (en) 2000-08-25
EP0944440A1 (en) 1999-09-29
WO1998028090A1 (en) 1998-07-02
ES2224291T3 (en) 2005-03-01
JP4059526B2 (en) 2008-03-12

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